Knight & Hale Echotech Turkey Pot Call Striker Improves the sound quality and vocalization realism of all friction Calls: Glass, Crystal, Slate, aluminum and Ceramic Patent-pending internal resonator allows more forgiving contact and a cleaner, quicker surface reaction, creating more natural, precise Tones Easy to operate with precision; suitable for beginner and intermediate callers Waterproof tip and sturdy diamond wood construction for season-after-season Use